JP2003056000A - High lift crane vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economically advantageous high lift crane vehicle having the function of performing crane work in a high lift with easiness of movement by partially remodeling the working machine of a highly versatile hydraulic backhoe. SOLUTION: This high lift crane vehicle comprises a boom 13 axially supported at the base end by the rotating frame of a super structure 12 supported by a lower structure 11 and having a guide sheave 37 arranged on the back part; a boom cylinder 15 arranged between the rotating frame and the boom 13; an arm 16 pivotally supported at the tip part of the boom 13 and comprising guide sheaves 24 and 38; an arm cylinder 17 arranged between the boom 13 and the arm 16; a crane mechanism 20 suspended at the end of the arm 16; and a winch 35 set on the super structure. Two or more wire ropes 41 and 42 operated by the winch 35 are laid around the guide sheaves, at least one of them is fixed to the crane mechanism 20 and used as a lifting rope, and the excavating bucket 30 of the crane mechanism is liftably suspended by the lifting rope and the other rope.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-lift vehicle capable of mainly hoisting work at a large depth or hoisting equipment.

[0002]

2. Description of the Related Art Recently, when carrying out excavated soil at a construction site, for example, a reverse construction method of a method of constructing a structure from the above-ground part to the upper part and at the same time digging it underground also constructs an underground structure. It has been adopted to streamline construction work. In order to carry out the earth and sand excavated at the excavation site using such a reverse construction method to the outside, the place to carry out the earth and sand will be changed, so for example, in the case of tunnel excavation work, the place to carry out the excavated soil must be specified. , It is not possible to adopt a method in which the earth and sand excavated from the ground to that position is carried to the above-ground part by a stationary earth and sand carrying-out device and then transferred to a dump truck and carried out. For this reason, the earth and sand excavated underground is to be transported to the processing site by dump trucks by changing the shipping location and carrying it to the ground in a short period of time.

From the above, the excavated earth and sand are
It is necessary to transfer the material from underground to above ground inside the building where construction work is in progress, and at the same time, to transfer it to a dump truck and carry it out. In addition, in civil engineering construction work other than the above-mentioned reverse construction method, when carrying out work such as carrying out excavated soil from the underground excavation work site and carrying it out to the treatment plant, recently, excavation at a large depth from underground is performed. There is an increasing amount of work that involves dumping the soil to the ground at once and carrying it out.

In this way, construction sites involving recent excavations,
In particular, in the construction that carries a large amount of excavated soil from the underground to the ground and transports it to places other than the site, it is easy to move and lift the sediment, etc. from the state where the sediment transporting device was placed and used as before. There is an increasing demand for work machines that can do it. However, in the lifting work inside such a building being constructed, the working machine has a height limitation, and it is structurally difficult to use a lifting machine such as a commonly used crawler crane. It is impossible. In addition, when there is an obstacle such as an aerial line around or around the construction site in an urban area, the height of the working machine is often restricted. At the construction site subject to such height restrictions, there is a problem in that it is difficult to use the conventional lifting machine to carry out the sediment, and the construction period is prolonged.

[0005]

Therefore, in order to solve the above-mentioned problems, the applicant of the present invention has proposed a prior invention (Japanese Patent Application No. 2000-8532) to provide a so-called low vehicle height and high lift. He proposed a work machine that can work.
This work machine is provided with a boom support mechanism by parallel four-bar links on a traveling vehicle body, and is configured to hang a lifting device at the tip of the boom to perform lifting work in a low posture. When the boom has a telescopic structure, it can be slid horizontally to move the hanging position.

According to this working machine, by adopting the parallel four-bar linkage mechanism for the boom support mechanism, the overall height can be kept low, and the boom telescopic mechanism has the advantage of facilitating the forward movement of the suspended load. This is advantageous for work in places where the ceiling height inside the building is severely restricted. However, in the invention of this prior application, since the hoisting means (winch) is incorporated in the hoisting device, the self-weight at the hoisting portion becomes large, which causes a structural problem. Therefore, we made the winch an in-vehicle structure to solve the problem, but in this technology, the boom support mechanism and the telescopic mechanism itself are quite complicated, and both the boom support mechanism undulating operation and the telescopic mechanism telescopic operation are performed. There is a problem that the operation system becomes complicated due to the necessity of the operation system and the price of the device becomes expensive. In addition, since it is completely different from the working machine structure of a standard hydraulic excavator having general versatility, it must be owned as a dedicated machine. Therefore, there is a problem in that the consumer is burdened with a plurality of models.

In addition to this, as a lifting machine at the site where the space height is restricted, for example, Japanese Unexamined Patent Publication No. 10-120369 discloses a crane for underground construction. In the crane described in this publication, a telescopic boom that expands and contracts in the horizontal direction is provided on a traveling carriage, and a winch for hoisting a wire rope that operates a suspender suspended from the boom tip is provided at the base end of the telescopic boom. It is described that the structure is equipped with an elevating device and a turning device that are mounted and that elevate and lower such a telescopic boom.

However, in this structure, since the winch for hoisting the load by the wire rope is mounted on the base end of the telescopic boom, naturally the winch winding amount increases as the lifting height during the lifting operation increases. There is a problem in that it is structurally difficult to attach it to the base end of the boom. Further, when the winch mounted on the boom becomes large, there is a problem that the lifting device for lifting the boom naturally needs to have a large capacity, and the related devices also become large. In addition, this type of working machine is also a dedicated machine, like the working machine according to Japanese Patent Application No. 2000-8532, so that it is burdensome to have a plurality of models as a consumer to own. There is a problem.

The present invention has been made in view of such a situation, and a function of performing lifting work at a high lift by facilitating movement by partially modifying a highly versatile hydraulic excavator work machine. It is an object of the present invention to provide a high-lift vehicle that possesses the characteristics of a vehicle and is economically advantageous.

[0010]

In order to achieve the above-mentioned object, the high-lift vehicle according to the first aspect of the present invention has a base end pivotally supported by an upper swing body supported on a lower traveling body. Arm supporting mechanism composed of a member capable of hoisting, an arm axially supported by the arm supporting mechanism so as to be hoistable, guide sheaves arranged at both ends of the arm and the arm supporting mechanism, and from the tip of the arm. A winch for lifting and lowering a lifting wire rope of a lifting mechanism is provided around the guide sheave, and the winch is installed on the upper swing body or a main member of the arm support mechanism. It is a thing.

According to the present invention, both the arm support mechanism and the arm are configured to be capable of undulating, and the winch for raising and lowering the lifting wire rope of the lifting mechanism is installed on the arm support mechanism or the upper swing body. By raising and lowering the arm support mechanism and the arm in cooperation with each other, the height from the ground to the uppermost part of the working machine can be lowered at a position where the height is restricted, and the lifted object can be horizontally moved. In addition, a lifting mechanism that is hung from the tip of the arm by a lifting wire rope, for example, a clamshell bucket, can be operated at a high lift, so when carrying out excavated soil at a large depth, lift the bucket. Since it can be moved horizontally as it is, it is possible to carry out a series of operations up to loading on a dump truck and improve work efficiency.

A high-lift vehicle according to a second aspect of the present invention comprises a boom in which a base end is axially supported by a revolving frame of an upper revolving structure supported by a lower traveling body and a guide sheave is arranged on the back.
Between the boom and the arm, a boom cylinder that is disposed between the swing frame and the boom to oscillate the boom, an arm that is axially supported by the tip of the boom and that has guide sheaves at both front and rear ends, and between the boom and the arm. An arm cylinder that is arranged to undulate the arm, a suspending body that is suspended at the tip of the arm, and a winch that is installed on the upper revolving structure are provided, and the reel is rolled up by the winch. By circulating a plurality of wire ropes around the guide sheave,
At least one of them is fixed to the hanging body to be a lifting rope, and the lifting bucket and other ropes suspend the excavation bucket below the hanging body through the hanging body. It is characterized by having a configuration.

According to the second aspect of the invention, the boom, the base end of which is axially supported on the swing frame of the upper swing body, is undulated by the boom cylinder, and the arm that is axially supported by the tip end of the boom and extends forward is also an arm. Since it is configured to be hoisted by the cylinder, the hoisting of the boom and arm is controlled to adjust the position of the arm tip, so that the position of the suspended body suspended at the arm tip can be adjusted to the working condition. Depending on the situation, the upper swing body side can be moved away from or closer to the upper swing body side, and by displacing the two depending on the situation, the position of the hanging body can be changed without significantly undulating the boom or arm. In other words,
The excavation bucket can be moved without causing the work machine to significantly fluctuate ups and downs.

According to the present invention, the boom and the arm which can be raised and lowered are combined, and the excavation bucket is moved up and down along with the back of these members and the opening and closing wire rope is roped, and the excavation is performed. The bucket can be lifted up and down via the hanging body at the end of the arm, so it can be compacted and the excavation bucket can be suspended without causing the work machine to undulate as described above. The position can be moved, and the wire rope can be distributed when the hoisting bucket is moved up and down by the hanging body so that shaking and rotation can be prevented. To facilitate. Further, it becomes possible to carry out a stable elevation at a high lift. Therefore, it is possible to carry out the underground excavated soil at a large depth and directly load the carried-out soil to the dump truck directly on the above-ground portion or the like, and it is possible to significantly improve the workability.

Further, in the present invention, the lower traveling body, the upper revolving body, and the boom are constructed by utilizing the essential parts of a hydraulic excavator having general versatility to modify the arm portion, change the lifting portion, and mount the winch onboard. By doing so, it becomes possible to convert a general-purpose hydraulic excavator to a high-lift vehicle, and it is possible to provide a low-cost, high-performance lift vehicle.

Further, according to the present invention, as described above, since the bi-joint hoisting operation of the boom and the arm can be performed, the forward and backward movement of the earth and sand from the excavation carry-up position to the discharge (waste soil) position can be reduced. The loading work on the dump truck is easy. Therefore, the dump truck can be arranged at the front position of the high-lift vehicle, and the occupation width can be reduced and the work can be effectively performed even at the construction site adjacent to the road. In addition, in transportation, since the posture can be made low like the hydraulic excavator, it can be economically transported.

Further, the arm support mechanism or the boom has a base end shaft hole axially supported by the revolving frame, an intermediate support shaft connecting the tip end of the hoisting boom cylinder, and the arm connected at the tip end. A front end shaft hole portion that pivotally supports, and a support bracket that pivotally supports a base member of a main member of an arm support mechanism of the arm or an arm cylinder for raising and lowering an arm provided on an upper surface of the boom. A guide sheave that guides the wire rope wound and unwound by the winch is preferably arranged at the back of the boom (third invention). By doing this, the main member of the arm support mechanism or the boom is provided with a shaft hole provided in the shaft hole, and the cylinder for hoisting is connected to the intermediate support shaft portion, so that the main member or the boom can be hoisted on the swing frame, and the back part can be lifted. A wire rope for suspending and raising and lowering an excavation bucket vertically attached to the end of an arm by a guide sheave provided in the arm and a guide sheave arranged in the vicinity of the arm connection position without affecting the main member or the boom. Can be operated.

Further, the arm support mechanism or the boom is connected to the base end shaft hole portion axially supported by the revolving frame, an intermediate support shaft connecting the tip end portion of the hoisting boom cylinder, and the arm end portion. A main shaft of the arm supporting mechanism, or a support bracket for pivotally supporting the base end of an arm cylinder for raising and lowering the arm provided on the lower surface of the boom. Guide sheaves for guiding the wire rope wound and unwound by the winch are preferably arranged at the back of the boom and the rear end of the arm (fourth invention). With this arrangement, the arm cylinder is arranged on the lower surface side of the main member or the boom so that the arm can be raised and lowered, so that the wire rope can be easily arranged above the arm cylinder and the holding pressure of the arm cylinder can be reduced. It has the advantage of being low.

A clamshell bucket is used as an excavator suspended from the suspension body of the lifting mechanism, and at least two suspension wire ropes and a bucket opening / closing wire rope for operating the clamshell bucket have their functions. It is preferable that each winch be operated by two independent winches (fifth invention). With this arrangement, when the earth and sand excavation work is carried out by the clamshell bucket, the operation of the winch can be surely performed by driving the winch according to each function, and as a result, the operation control is facilitated. Further, it is preferable that the drive shafts of the two winches are coaxially arranged (sixth invention). With this configuration, the winches can be synchronously rotated and can be compactly installed together.

The wire rope is installed on the excavator through a winding shed of a winch mounted on a vehicle, a guide sheave provided at both ends of the arm supporting mechanism or the boom and the arm, and guide sheaves of the lifting mechanism. It is suspended and wound so as to reach the lifting mechanism (seventh invention). By doing so, the wrapped wire rope can follow the displacement of the undulating portion of the two-joint structure without difficulty, and even when the suspended excavator is operating, the lifting body of the lifting mechanism can lift the clamshell bucket. Wire ropes for opening and closing can also be effectively utilized as hanging lifting ropes, and by setting the distribution of these wire ropes in the hanging body, it is possible to prevent runout and rotation during lifting and to perform normal lifting operations. You can

In the first and second aspects of the invention, it is preferable that the winch for operating the wire rope is installed above the counterweight at the rear of the revolving frame (eighth aspect of the invention). Further, it is preferable that a recess is provided at the center of the upper surface of the counterweight installed at the rear of the upper swing body, and the winch is stored and installed in this recess (ninth invention). Further, for the winch installed on the upper surface of the counterweight, it is preferable that a protective cover surrounding the winch is installed on the counterweight (the tenth invention). By installing the winch on the counterweight in this way, the mass can be utilized as the counterweight, which is economical. Further, by installing the winch in a recess or enclosing the winch with a cover, safety to the outside can be secured.
If a cover is provided, it can be opened and closed to facilitate inspection and maintenance.

Further, for the wire rope from the winding drum of the winch to the lifting mechanism suspended at the tip of the arm,
A rope tensioner for tensioning the wire rope may be arranged between the winding drum of the winch and a guide sheave attached to the rear end of the arm (the eleventh invention). By doing so, each wire rope can always maintain a tensioned state, and the lifting of the excavator is ensured without uneven movement of the wire rope during hoisting operation at high lift. be able to.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Next, specific embodiments of a high-lift vehicle according to the present invention will be described with reference to the drawings.

FIG. 1 shows an overall external view of the high-lift vehicle of this embodiment. Note that, in this figure, the mode in which the boom and the arm are displaced is also shown by a chain double-dashed line. FIG. 2 is a front view showing a support structure for the bucket suspension frame and the bucket, and FIG. 3 is a view taken along line AA of FIG.

The high-lift vehicle 10 of this embodiment has an upper swing body 12 mounted on a track-type lower traveling body 11 via a swing mechanism, and a swing frame (not shown) of the upper swing body 12 is provided. A boom 13 (corresponding to the arm support mechanism of the present invention) having a curved base end 13a is axially supported on the front upper part of the boom 13. The boom 13 projects laterally laterally from an intermediate side surface of the boom 13. The boom 13 is supported by a boom cylinder 15 that is arranged so as to connect the intermediate support shaft 14 and the revolving frame. An arm 16 having a required length is axially supported by a base portion 16a on the tip portion 13b of the boom 13.
A lifting mechanism 20 is hung at the tip of the arm 16, and a tip of a wire rope is provided along a back surface (upper surface) of the boom 13 and the arm 16 by a winch mounted on the upper swing body 12. The part is connected to a lifting mechanism 20 that is hung at the tip of the arm so that the part can be lifted. In the figure, reference numeral 12A is a driver's cab, and 19 is a counterweight.

The arm 16 is rotatably supported by a pivot pin 18 at a base portion 16a of a boom 13 having a bifurcated shape.
The rear end portion 16b of the arm cylinder 17 attached to the upper surface of the boom 13 is pin-connected to the rear end portion 16b of the base portion 16a. The arm 16 can be vertically swung up and down with respect to. Further, a pivot shaft 27 penetrating laterally orthogonal to the axis is attached to the tip end portion 16c of the arm 16, and the upper end portion is pivotally supported by the pivot shaft 27 to suspend the bucket of the lifting mechanism 20. A hanging frame 21 (corresponding to the hanging body of the present invention) is hung.

The arm cylinder 17 attached to the upper surface of the boom 13 has its base end pivotally supported at its base end by a bracket protruding from the back of the boom 13 and its rod end as described above. Pin-connected to the rear end portion 16b of the arm,
The arm 16 is pivoted up and down with the pivot pin 18 as a base point by the expansion and contraction operation so that the arm 16 can be raised and lowered.

The lifting mechanism 20 includes a bucket suspension frame 21 whose upper end portion is supported by a pivot shaft 27 and suspended from the tip end portion of the arm 16, and a lower portion of the bucket suspension frame 21. A clamshell bucket 30 to be suspended (hereinafter, simply referred to as bucket 30), a winch 35 mounted on the upper swing body 12, and the winch 35 extending from the winch 35 to the arm tip along the back of the boom 13 and the arm 16. The wire ropes 41 and 42 for suspending the bucket 30 via the bucket suspension frame 21.

The bucket suspension frame 21 is a frame body formed in a cross shape in which two sub-members 22b and 22b are attached to the right and left sides of two base members 22a which are upright, respectively. 22, sheave brackets 23, 23, 23, 23 integrally attached to the tips of the four-sided protruding portions of the frame body 22, upper portions of the base member 22a and upper portions of the sub-members 22b, 22b, and sheaves, respectively. Sheaves 24-2 supported on the bracket 23 by shaft pins, respectively.
6 and 6.

The sheaves 24 to 26 provided on the bucket suspension frame 21 are arranged as shown in FIGS. 2 and 3, and among the sheaves supported by the sheave bracket 23, in the axial direction of the arm 16. The sheaves 25a, 25a arranged front and back serve as guides for the wire rope 41 for moving the bucket 30 up and down, and the sheaves 25b, 25b located on the left and right crossing the axial direction guide the wire rope 42 for opening and closing the bucket. It is designed to be. The support positions of the sheaves 25 (represented by the reference numeral 25) are equidistant from the center of the bucket suspension frame 21. The vertical line passing through the center of the bucket suspension frame 21 is located on the plane passing through the hanging center line of the wire ropes 41 and 42 that hang on the guide sheaves 24 (top sheaves) arranged on the pivot shaft 27 at the base end. Are related to.

The bucket 30 has a well-known structure and has four wire ropes 41, 41, which are wound around sheaves 25 arranged on all sides of the bucket suspension frame 21.
42, of which two wire ropes are suspended as bucket suspension ropes 41 at the tip of the bucket 30.
The other two wire ropes are fixed to the support frame 31 and are wound around the bucket opening / closing sheave blocks 32 and 33 by a known means to form an opening / closing operation rope 42. In addition,
The opening / closing operation rope 42 has its end fixed to the winding drum of the winch 35, and is essentially a single wire rope. Therefore, the four wire ropes 41, 4
When the bucket 30 is hung and lifted, the buckets 1, 24, and 42 can be hung and lifted almost uniformly from four directions, so that the bucket 30 is lifted and lowered in a stable state without being greatly shaken in the middle. Is made possible.

The winch 35 for operating the wire ropes 41, 42 is provided with two winding drums at the rear portion of the operator's cab 12A of the upper swing body 12 so as to be aligned with one axis line orthogonal to the axial direction of the boom 13. Two are installed. As a general rule, these winches 35 are equipped with winding cylinders of the same diameter so that they rotate in synchronization with each other when the bucket 30 is lifted and lowered, and one of them rotates when the bucket 30 is opened and closed. Also, these winches 35
Is equipped with a hydraulic motor as a driving machine, and is controlled so that free fall of the bucket can be performed.

As shown in FIG. 1, the wire ropes 41 and 42 which are unwound and wound by the winch 35 are arranged such that the boom 13 and the arm 16 are extended from the winch winding drum.
The bucket 30 is wound up and down along the spine of the bucket through a sheave 24 (top sheave) at the tip and a guide sheave on the bucket suspension frame 21. Therefore, the wire ropes 41, 42 are connected to the guide sheave 37 supported by a bracket 36 protruding midway from the back of the boom 13 and the rod end of the arm cylinder 17 at the rear end 16b of the arm 16. A guide sheave 38 supported on the shaft 16d guides the boom 13 and the arm 16 so as not to contact the boom 13 and the arm 16.

Each operating portion of the lifting vehicle is adapted to be operated by a control means mounted on the upper swing body 12, and the control means is operated by a well-known operating means provided in the cab 12A. The boom 13 and the arm 16 can be raised and lowered and the hoisting mechanism 20 can be operated by the winch 35.

The high-lift vehicle 10 of this embodiment having the above-described structure can drive the track-type undercarriage 11 to move it to a desired position on the construction site for work.

For example, after excavating soil to a dump truck, in order to excavate earth and sand again into the vertical shaft (earth and sand loading port), the operator operates the boom cylinder 15 and the arm cylinder 17 in the operator cab 12A. The boom 13 and the arm 16 are raised and lowered by operating them respectively. That is, in FIG. 1, when the boom cylinder 15 and the arm cylinder 17 are extended, as shown by the chain line a, the boom 13 is raised from the position shown by the solid line and the arm 16 is laid down so that the tip of the arm 16 is at the top. It is drawn to the revolving unit 12 side. Therefore, if the winch 35 is driven and the wire ropes 41 and 42 are fed out in this state, the lifting mechanism 20 can be lowered and suspended in the vertical shaft.

If the arm cylinder 17 is extended while keeping the posture of the boom 13 in the state shown by the solid line in FIG. 1, the arm 16 moves from the pivot pin 18 at the tip portion 13b of the boom 13 as a base point. The lifting mechanism 20 that is rotated downward and is hung at its tip can be hung from the tip of the arm toward the shaft at the corresponding position as shown by the chain line b in FIG. In such a state, it is possible to lift and lower the bucket 30 of the lifting mechanism 20 while keeping the boom 13 in a low posture. And bucket 30
When the earth and sand have been carried out from the ground by means of the above, if the arm cylinder 17 is contracted as it is, the arm 16 can be rotated upward and projected to the front of the boom 13 (state shown by a solid line).

In the work of carrying out the sediment from the shaft, for example, the high-lift vehicle 10 is arranged in correspondence with the shaft (sand port), and the dump truck 50 is made to stand by at a position close to the port. , Boom 13 and arm 16
After the hoisting mechanism 20 is operated to position the lifting mechanism 20 above the sediment carrying port, the bucket 30 is lowered, the excavated soil in the ground is scooped by the bucket 30, and the bucket 30 is lifted to the ground. When the support frame 31 of No. 2 is placed on the lower surface of the bucket suspension frame 21 and the arm 16 is raised as it is and the boom 13 is moved from the upright state to the fallen state, it is indicated by a chain line c in FIG. It can be horizontally moved forward from the position (indicated by arrow P). Therefore, by opening the bucket 30 at an appropriate position on the loading platform of the dump truck 50 that is on standby, the carried-out earth and sand can be dropped and loaded onto the loading platform.

Thus, according to this embodiment, the boom 1
Dump truck 5 waiting for earth and sand carried from the ground by operating up and down 3 and arm 16 at the same time
Workability can be improved because the work of moving it with respect to 0 and loading it as it is can be performed continuously. In addition, since the lifting work can be performed while keeping the boom 13 and the arm 16 suspending the lifting mechanism 20 in a low posture, the boom 1 can be extremely operated even in the work where the height is restricted.
You can work without difficulty unless you bring up 3. Of course, the turning operation and the hoisting operation can be performed in the same manner as the hydraulic excavator, and thus the operability is good, and at the time of transportation, the arm 16 is folded under the boom 13 to lower the vehicle height and transport the vehicle. can do.

Next, another embodiment of the high-lift vehicle is shown in FIG. 4 in which the winch 35 is arranged on the counterweight 19. In this embodiment, the basic structure is the same as that of the above-mentioned embodiment except for the arrangement of the winch, and therefore, the same reference numerals are given to the same portions as those of the above-mentioned embodiment, and detailed description will be given. The description is omitted.

In the high-lift vehicle 10A of this embodiment, the winch 35 is installed on the counterweight 19 arranged at the rear part of the upper swing body 12, and the arm is provided via the guide sheave 37 provided on the back part of the boom 13. The wire ropes 41 and 42 are drawn out to the 13 side. In this case, the winch 35 functions as a part of the counterweight 19, which is advantageous for the vehicle.

As described above, when the winch 35 is arranged on the counterweight 19, the upper portion of the counterweight 19 is made a hollow, and the winch 35 is placed at that portion.
Is preferably arranged. Further, by surrounding the place where the winch 35 is installed with a cover to protect the outside, it is possible to secure safety for the winch and outside during operation. When a cover (not shown) is provided, it is possible to open and close the winch to facilitate inspection and maintenance of the winch.

FIG. 5 shows another embodiment of the high-lift vehicle, which has the same basic structure as that of the above-mentioned embodiment but is different in the attachment position of the arm cylinder. Therefore, the same or similar configurations are designated by the same reference numerals as those in the above-described embodiment, and detailed description thereof is omitted.

The high-lift vehicle 10B of this embodiment is
An arm cylinder 17 for performing an up-and-down operation of the arm 16 is a bracket 17e attached downward to the lower surface of the boom 13.
The base end of the rod 17a is pivotally supported by, and the tip of the rod 17a is pin-connected to the bracket 17f attached to the lower surface of the base of the arm 16 at the front of the base 16a.

With such a structure, the arm cylinder 17 is arranged on the lower surface side of the boom 13, so that the wire ropes 41,
The guide sheave 37 for avoiding the contact of the arm cylinder 17 with the armature 42 is not positioned higher, so that the roping can be facilitated. Further, there is an advantage that the holding pressure of the arm 16 by the arm cylinder 17 can be set low. Even in this form, the winch 35 can be installed on the counterweight 19 as shown by the chain line d in FIG.

In addition, the high-lift vehicle 10 of each type described above.
In (10A, 10B), as shown in FIG.
A role of the rope tensioner 45 can be added to the support structure of the guide sheave 37 provided on the back of the boom 16.

This rope tensioner 45 is used for the boom 1
A guide sheave 37 is rotatably supported by a link 45a of a required length whose base end is pivotally supported by a bracket 36a provided at the back of the No. 3, and a gas is provided between the middle of the link 45a and the back of the boom 13. A spring 45b or a compression spring is arranged so that a biasing force having a cushioning property that constantly pushes the guide sheave 37 upward is applied.

The wire ropes 41 and 42 are always kept in a tension state by attaching the rope tensioner 45, and even when the bucket 30 is moved up and down, the suspended state is maintained evenly. As described above, the bucket 30 can be lifted and lowered in a stable state under the hanging condition distributed by the bucket hanging frame 21 without causing shake or rotational movement. Further, in the winch 35 as well, since the rope is not loosened, irregular winding does not occur and normal operation can be performed.

Next, FIG. 7 shows a winch 35.
It is an embodiment in the case where is mounted at a position from the base end on the back of the boom 13. In this case, by installing the winch 35 so that the mounting position is within the total height H of the vehicle, preferably below the ceiling of the cab 12A, it is possible to secure the vehicle height during transportation of the main body and reduce the transportation cost. Has the advantage that

According to the high-lift vehicle of this embodiment having such a structure, for example, a hydraulic excavator can be partially modified to be a working vehicle for performing high-lift operations, and a standard lever operation of the shovel is possible. The workability is good because it has a configuration and a function that can be operated without breaking the method. Further, as described above, the height of the vehicle at the time of work can be lowered, so there are few restrictions on the work site. Moreover, since a stable hoisting operation is possible and lateral movement of the hoisting mechanism is easy after unloading, it is possible to efficiently carry out the earth and sand unloading work at a high lift (large depth). Of course, since it is highly mobile, it has the advantage that it can be used even in poor working conditions.

[Brief description of drawings]

FIG. 1 is an overall external view of a high-lift vehicle according to this embodiment.

FIG. 2 is a front view showing a support structure for a bucket suspension frame and a bucket.

FIG. 3 is a view taken along the line AA of FIG.

FIG. 4 is a diagram showing another embodiment of a high-lift vehicle.

FIG. 5 is a diagram showing another embodiment of a high-lift vehicle.

FIG. 6 is a diagram showing another embodiment of the high-lift vehicle.

FIG. 7 is a diagram showing another embodiment of a high-lift vehicle.

[Explanation of symbols]

10,10A, 10B High-lift truck 11 Undercarriage 12 Upper revolving structure 12A cab 13 boom 15 boom cylinder 16 arms 17 arm cylinder 18 pivot pins 19 counterweight 20 Lifting mechanism 21 bucket hanging frame 24-26 sheaves 30 buckets 35 winches 37,38 guide sheave 41,42 wire rope 45 rope tensioner

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) E02F 3/47 E02F 3/47 B 5/02 5/02 R

Claims (11)

[Claims] 1. An arm support mechanism comprising a member capable of hoisting and having a base end axially supported by an upper revolving structure supported on a lower traveling body, and an arm pivotally supported by the arm support mechanism so as to be hoistable. A guide sheave disposed at both ends of the arm and the arm support mechanism, and a winch that winds and unwinds a lifting wire rope of a lifting mechanism that hangs down from the tip of the arm around the guide sheave. A high-lift vehicle, wherein the winch is installed in the upper swing body or a main member of the arm support mechanism. 2. A boom having a base end axially supported by a revolving frame of an upper revolving structure supported by a lower traveling structure and a guide sheave disposed on a back portion thereof, and the boom being disposed between the revolving frame and the boom. A boom cylinder for undulating a boom, an arm axially supported by the tip of the boom and provided with guide sheaves at both front and rear ends, an arm cylinder arranged between the boom and the arm for undulating the arm, A suspending body suspended at the tip of the arm and a winch installed on the upper swing body are provided, and a plurality of wire ropes wound and fed by the winch are circulated around the guide sheave. At least one of the ropes is fixed to the hanging body to serve as a lifting rope, and the lifting rope and another rope raise the excavation bucket below the hanging body through the hanging body. A high-lift vehicle, which is configured to be freely suspended. 3. The arm support mechanism or the boom is connected at its base end shaft hole portion axially supported by a revolving frame, an intermediate support shaft for connecting a tip end portion of a hoisting boom cylinder, and the arm at its tip end portion. A distal end shaft hole portion for axially supporting and a support bracket for pivotally supporting a main member of the arm supporting mechanism or a base end portion of an arm cylinder for raising and lowering an arm provided on an upper surface portion of the boom. 2. A guide sheave that guides a wire rope wound and unwound by the winch is arranged at the back of the boom.
Alternatively, the high-lift vehicle of item 2 above. 4. The arm support mechanism or the boom is connected to a base end shaft hole portion axially supported by a revolving frame, an intermediate support shaft connecting a tip end portion of a hoisting boom cylinder, and the arm end portion. A main shaft of the arm supporting mechanism, or a support bracket for pivotally supporting the base end of an arm cylinder for raising and lowering the arm provided on the lower surface of the boom. The high-lift vehicle according to claim 1 or 2, wherein guide sheaves for guiding the wire rope wound and unwound by the winch are disposed at the back of the boom and the rear end of the arm. 5. A clamshell bucket is used as an excavator that is suspended by a suspension body of the lifting mechanism, and the at least two suspension wire ropes and the bucket opening / closing wire rope that operate the clamshell bucket are: The high-lift vehicle according to claim 1 or 2, wherein the winch is operated by two winches that are independent for each function. 6. The high-lift vehicle according to claim 5, wherein the drive shafts of the two winches are coaxially arranged. 7. The excavator is provided with the wire rope through a winding sheave of a vehicle-mounted winch via guide sheaves provided on both ends of the arm support mechanism or boom and the arm, and guide sheaves of the lifting mechanism. The high-lift vehicle according to any one of claims 1, 2, and 5, wherein a machine is suspended and wound so as to reach the lifting mechanism. 8. The high-lift vehicle according to claim 1, wherein the winch for operating the wire rope is installed above the counterweight at the rear of the turning frame. 9. The high-lift vehicle according to claim 8, wherein a recess is provided in a central portion of an upper surface of a counterweight installed at a rear portion of the upper swing body, and the winch is stored in the recess. 10. The high-lift vehicle according to claim 8, wherein, for a winch installed on the upper surface of the counterweight, a protective cover surrounding the winch is installed on the counterweight. 11. A wire rope from the winding drum of the winch to a lifting mechanism hung at the tip of the arm, and between the winding drum of the winch and a guide sheave attached to the rear end of the arm. The high-lift vehicle according to any one of claims 1 to 4, wherein a rope tensioner for tensioning the wire rope is arranged.